Francisco Javier Santos Alamillos <fsantos <at> ujaen.es> writes:
> > Hi everybody, > > I have some problems with the function eigen. I have a square matrix and I > want to calculate the eigenvalues and eigenvectors. I apply the function > eigen and I get it, however when I solve the same problem in Statistica > software, I realise that some eigenvectors are the opposite. How can I get > the same values? > > Thanks in advance > Multiply by -1 :-) Seriously, though, the eigenvectors can be multiplied by any constant (if L.M = aL, then (cL).M = a(cL)). (They are usually scaled to have norm 1, i.e. L.L=1.) If you are trying to match something from a previous problem, you can check the sign of one particular variable and adjust the eigenvector appropriately. Ben Bolker ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
